Check out a free preview of the full JavaScript for WordPress course:
The "Calypso" Lesson is part of the full, JavaScript for WordPress course featured in this preview video. Here's what you'd learn in this lesson:

Zac introduces Calypso, which is a re-envisioning of the WordPress application as a Single Page Application (SPA) built on React by the folks that make WordPress. - https://developer.wordpress.com/calypso/

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